Pollution and its effects 1 adriana varzaru
Published on: Mar 4, 2016
Transcripts - Pollution and its effects 1 adriana varzaru
Pollution and its effects Adriana Varzaru
Causes of pollutionNew inventions and processes have been continuously developed to improve our way of life. Such developments are called technological advances. Technological advances help us, but many of them also bring about harm to the environment.Many pollution problems have developed because methods of preventing pollution are expensive. Many waste products could be reused in some way. But, such practices have seldom been followed, partly because of the high cost of adjusting manufacturing activities to reprocess waste products.
Types of pollution► Soil pollution damages the thin layer of fertile soil that covers much of the earth’s land and is essential for growing food. Natural processes took thousands of years to form the soil that supports crops. But, through poor treatment, people can destroy soil in a few years. In nature, cycles similar to those that keep water clean work to keep soil fertile. Plant and animal wastes, including dead organisms, accumulate in the soil. Bacteria and fungi decay these wastes, breaking them down into nitrates, phosphates, and other nutrients► Solid wastes are probably the most visible forms of pollution. People throw away billions of tons of solid material each year. Much of this waste ends up littering roadsides, floating in lakes and streams, and collecting in ugly dumps. Examples of solid wastes include junked automobiles, tires, refrigerators, and stoves; cans and other packaging materials; and scraps of metal, paper, and plastic. Such solid pollutants are most common in the heavily populated areas in and near cities.
WATER POLLUTIONWater pollution reduces the amount of pure, fresh water that is available for such necessities as drinking and cleaning, and for such activities as swimming and fishing. The pollutants that affect water come mainly from industries, farms, and sewerage systems. Most of the pollutants that people put into water come from treated and untreated sewage, from agricultural drainage, and from industrial wastes. The pollutants reduce valuable supplies of pure, fresh water by upsetting the natural cycles that work to keep water clean .
Controlling pollution► Some lakes and rivers may already be so badly polluted that they may not be able to regain their health even if all pollution is stopped. Some soil has been too badly eroded to support crops any more. But in most areas, effective programs to prevent pollution could greatly improve environmental conditions.► Several different approaches can be used to control pollution. Waste products can be saved and used again. New technological developments can help prevent pollution from older ones. Restrictions can be placed on the use of materials that pollute. These approaches may result in less convenience and higher costs, however .► Recycling. The reprocessing of waste products for reuse is called recycling. Many kinds of wastes can be recycled. Some, including cans and newspapers, can be used over and over again for the same purposes